Solvay Chemicals, Inc. offers three polyglycerols: Diglycerol, Polyglycerol-3, and Polyglycerol-4. These products are polyols consisting of glycerol molecules bonded by an ether linkage, more viscous than glycerol and soluble in aqueous systems.URL:http://www.solvaychemicals.us/products/productshidden/0,,40563-2-0,00.htm in English [Translate]